[Zope] Sorting on 2 or more properties

[Michael Long]

Hi all,

I am passing a list of objects to a zpt and would like to sort them on 2
or more of the properties. For example I have a class object with the
following properties:

id
professor_name
student_name
course_number

I would like to sort first on the professor_name, then course_number,
and then finally student_name. I have googled and can only find examples
for sorting on one property at a time.

tia,
Mike